Microsemi Corporation SG1731J, SG1731J-883B, SG2731J, SG2731N, SG3731J Datasheet
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SG1731/SG2731/SG3731
DC MOTOR PULSE WIDTH MODULATOR
DESCRIPTION
The SG1731 is a pulse width modulator circuit designed specifically for DC motor
control. It provides a bi-directional pulse train output in response to the magnitude
and polarity of an analog error signal input. The device is useful as the control
element in motor-driven servo systems for precision positioning and speed control,
as well as in audio modulators and amplifiers using carrier frequencies to 350 KHz.
The circuit contains a triangle waveform oscillator, a wideband operational amplifier
for error voltage generation, a summing/scaling network for level-shifting the
triangle waveform, externally programmable PWM comparators and dual ±100mA,
±22V totem pole drivers with commutation diodes for full bridge output. A
SHUTDOWN terminal forces the drivers into a floating high-impedance state when
driven LOW. Supply voltage to the control circuitry and to the output drivers may be
from either dual positive and negative supplies, or single-ended.
BLOCK DIAGRAM
FEATURES
••
±±
•
±3.5V to
••
±±
••
±±
•
±2.5V to
••
±±
••
• Dual 100mA source/sink output
••
drivers
••
• 5KHz to 350KHz oscillator range
••
••
• High slew rate error amplifier
••
••
• Adjustable deadband operation
••
••
• Digital SHUTDOWN input
••
±±
±15V control supply
±±
±±
±22V driver supply
±±
HIGH RELIABILITY FEATURES
- SG1731
♦♦
♦ Available to MIL-STD-883
♦♦
♦♦
♦ LMI level “S” processing available
♦♦
4/90 Rev 1.3 9/99 LINFINITY Microelectronics Inc.
Copyright 1999 11861 Western Avenue
1 (714) 898-8121
∞ ∞
∞ Garden Grove, CA 92841
∞ ∞
∞∞
∞ FAX: (714) 893-2570
∞∞
ABSOLUTE MAXIMUM RATINGS (Note1)
Supply Voltage (±VS) ........................................................ ±18V
Analog Inputs....................................................................... ±V
Digital Inputs (SHUTDOWN) .................... -VS-0.3V to -VS+18V
Output Driver Supply Voltage (±V
Source/Sink Output Current (continuous) .................... 200mA
) ................................. ±25V
O
Source/Sink Output Current (peak, 500ns).................. 400mA
Note 1. Values beyond which damage may occur.
THERMAL DATA
SG1731/SG2731/SG3731
Output Driver Diode Current (continuous) .................... 200mA
Output Driver Diode Current (peak, 500ns) .................. 400mA
S
Operating Junction Temperature
Hermetic (J - Package) ............................................... 150°C
Plastic (N - Package) .................................................. 150 °C
Storage Temperature Range ............................ -65°C to 150°C
Lead Temperature (Soldering, 10 Seconds) .................. 300 °C
J Package:
Thermal Resistance-Junction to Case, θ
Thermal Resistance-Junction to Ambient, θJA.......... 80°C/W
.............. 30°C/W
JC
N Package:
Thermal Resistance-Junction to Case, θ
Thermal Resistance-Junction to Ambient, θJA......... 65°C/W
.............. 40°C/W
JC
Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA).
Note B. The above numbers for θ
resistance of the package in a standard mounting configuration.
The θJA numbers are meant to be guidelines for the thermal
performance of the device/pc-board system. All of the above
assume no ambient airflow.
are maximums for the limiting thermal
JC
RECOMMENDED OPERATING CONDITIONS (Note 2)
Supply Voltage Range (±VS)............................... ±3.5V to ±15V
Error Amp Common-Mode Range ............... -VS + 3V to VS - 3V
Output Driver Supply Voltage Range.................. ±2.5V to ±22V
Source/Sink Output Current (continuous) .................... 100mA
Source/Sink Output Current (peak, 500ns) .................. 200mA
Output Driver Diode Current (continuous) .................... 100mA
Output Driver Diode Current (peak, 500ns) .................. 200mA
Note 2. Range over which the device is functional and parameter limits are guaranteed.
Oscillator Frequency Range ........................... 10Hz to 350KHz
Oscillator Voltage (Peak-to-Peak) .............................1V to 10V
Oscillator Timing Capacitor (CT) ....................... 200pF to 2.5µF
Operating Ambient Temperature Range
SG1731 ........................................................ -55°C to 125°C
SG2731 ........................................................... -25°C to 85°C
SG3731 .............................................................. 0°C to 70°C
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specfiications apply over the operating ambient temperatures for SG1731 with -55°C ≤ TA ≤ 125°C, SG2731 with
-25°C ≤ TA ≤ 85°C, SG3731 with 0°C ≤ TA ≤ 70°C, VS = ±15V, and VO = ±22V. Low duty cycle pulse testing techniques are used which maintains junction
and case temperatures equal to the ambient temperature.)
Parameter Units
Oscillator Section
CT Charging Current
2V∆± Input Bias Current
Initial Oscillator Frequency
Temperature Stability
(Note 3)
TA = 25°C
TA = T
MIN
VCM = ±5V
CT = 1000pF, 2V∆± = ±5V,TA = 25°C
CT = 1000pF, 2V∆± = ±5V
Error Amplifier Section (Note 5)
Input Offset Voltage
Input Bias Current
Input Offset Current
Open Loop Voltage Gain
Output Voltage Swing
RL = 2KΩ
RL = 2KΩ
Common-Mode Rejection Ratio
Slew Rate (Notes 3 and 4)
Unity Gain Bandwidth (Notes 3 and 4)
TA = 25°C
TA = 25°C
PWM Comparators
Input Bias Current 6 µA±VT = ±3V
Test Conditions
to T
MAX
SG1731/2731/3731
Min. Typ. Max.
500
450
400
550
600
-20
25.0
22.5
27.5
10
10
3
600
70
±10
70
5
10
0.7
1
µA
µA
µA
KHz
%
mV
µA
nA
dB
V
dB
V/µs
MHz
4/90 Rev 1.3 9/99 LINFINITY Microelectronics Inc.
Copyright 1999 11861 Western Avenue
2 (714) 898-8121
∞ ∞
∞ Garden Grove, CA 92841
∞ ∞
∞∞
∞ FAX: (714) 893-2570
∞∞
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